"What in the hell are we doing?" Biden said, specifically referencing Secretary of State Rex Tillerson's plan to skip an annual NATO meeting and instead travel to Russia.

What in the hell are we doing?" @JoeBiden says of Trump administration "romance with Putin" https://t.co/mhAv9owy7h

Biden's comments came just days after FBI Director James Comey announced the FBI was actively investigating the Trump campaign's potential ties to Russia — and just hours after a bombshell report from the Associated Press revealed former Trump campaign chairman Paul Manafort secretly made millions working for a Russian billionaire with the end goal of benefiting Russian President Vladimir Putin.